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A Study of Stellar Photometric Variability Within the Central 4 pc of the Galactic Center with Infrared Image Subtraction

Peeples M. S., Stanek K. Z., DePoy D. L.

Acta Astronomica

2007

Vol. 57, No. 2

173--199

We present a catalog of 110 variable stars within ≈1' of Sgr A* based on image subtraction of near-infrared (H and K) photometry. Our images were obtained over 133 nights from 2000 to 2002 in H-band and over 134 nights from 2001 to 2002 in K-band; the typical FWHM is 1".4. We match the catalog to other near-infrared, X-ray, and radio (i.e., maser) data, and we discuss some of the more interesting objects. The catalog includes 14 sources with measurable periods, several known long-period variables and three new LPV candidates. We associate IRS 10* with OH, SiO, and H2O masers and a bright X-ray point source; this analysis suggests IRS 10* is an AGB star with an accreting companion. Among the ≈90 newly discovered sources are a probable cataclysmic variable, a potential edge-on contact 84 day period eclipsing binary, and a possible 41 day period pulsating variable.

Using All-Sky Surveys to Find Planetary Transits

Pepper J., Gould A., DePoy D. L.

Acta Astronomica

2003

Vol. 56, No. 3

213--228

Transits of bright stars offer a unique opportunity to study detailed properties of extrasolar planets that cannot be determined through radial-velocity observations. We propose a new technique to find such systems using all-sky small-aperture transit surveys. We derive a general formula for the number of stars that can be probed for such systems as a function of the characteristics of the star, the planet, and the survey. We use this formula to derive the optimal telescope design for finding transits of bright stars: a 2 inch "telescope" with a 4k×4k camera.